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Author : Martin Krause
Publisher :
ISBN 13 :
Total Pages : 134 pages
Book Rating : 4.:/5 (59 download)
Download or read book On the Interaction of Jets with the Dense Medium of the Early Universe written by Martin Krause and published by . This book was released on 2002 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book On the Interaction of Jets with the Dense Medium of the Early Universe written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years, radio galaxies have been found at redshifts above five. They differ in higher radio power and emission line characteristics from sources nearby. To understand these centers of proto-galaxy-clusters, hydrodynamic jets with cooling were simulated. After validation of the 3D code NIRVANA by comparison with literature simulations, an adiabatic 2D parameter study in the relevant regime (density contrast jet/medium eta=10^{-2}-10^{-5} was performed. Characteristic cocoon shape and broadenings were found. The radial expansion can be analytically approximated by a spherical blast wave with constant energy injection. In a non-equilibrium simulation the bow shock cooled to 10^4 K during jet propagation time (external density 1 ccm. After global cooling and compression, the bow shock turned into a big absorber which fragmented, and should form stars in typically 10^4 globular clusters of 10^6 solar masses. Filamentation and fragmentation was confirmed at high resolution. Absorbers in far-off radio galaxies and globular cluster excesses in nearby CD galaxies can be explained that way. With literature parameters fo Cygnus~A, a 3D simulation, for the first time with counter-jet, was performed. The bow shock shows two clearly separated phases, also evident in observation. Basic jet parameters have been derived. The simulation shows characteristic X-ray features (rings) which were identified and interpreted in two sources (M87).
Author : A.J.L. Fernandes
Publisher : Springer Science & Business Media
ISBN 13 : 9400709994
Total Pages : 272 pages
Book Rating : 4.4/5 (7 download)
Download or read book Jets in Young Stellar Objects written by A.J.L. Fernandes and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt: A JENAM 2002 Workshop, Porto, Portugal, 3-5 September 2002
Author : Richard Wielebinski
Publisher : Springer Science & Business Media
ISBN 13 : 9783540241751
Total Pages : 306 pages
Book Rating : 4.2/5 (417 download)
Download or read book Cosmic Magnetic Fields written by Richard Wielebinski and published by Springer Science & Business Media. This book was released on 2005-09-13 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt: While magnetic fields permeate the universe on all scales, the present book is dedicated to their investigation on the largest scales and affords a balanced account of both theoretical and observational aspects. Written as a set of advanced lectures and tutorial reviews that lead up to the forefront of research, this book offers both a modern source of reference for the experienced researchers as well as a high-level introductory text for postgraduate students and nonspecialist researchers working in related areas.
Author : Aaron Angerami
Publisher : Springer Science & Business Media
ISBN 13 : 3319012193
Total Pages : 180 pages
Book Rating : 4.3/5 (19 download)
Download or read book Jet Quenching in Relativistic Heavy Ion Collisions at the LHC written by Aaron Angerami and published by Springer Science & Business Media. This book was released on 2013-12-02 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents the first measurements of jets in relativistic heavy ion collisions as reported by the ATLAS Collaboration. These include the first direct observation of jet quenching through the observation of a centrality-dependent dijet asymmetry. Also, a series of jet suppression measurements are presented, which provide quantitative constraints on theoretical models of jet quenching. These results follow a detailed introduction to heavy ion physics with emphasis on the phenomenon of jet quenching and a comprehensive description of the ATLAS detector and its capabilities with regard to performing these measurements.
Author : Wolfgang E. Nagel
Publisher : Springer Science & Business Media
ISBN 13 : 3540361839
Total Pages : 538 pages
Book Rating : 4.5/5 (43 download)
Download or read book High Performance Computing in Science and Engineering ' 06 written by Wolfgang E. Nagel and published by Springer Science & Business Media. This book was released on 2007-07-26 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the state-of-the-art in simulation on supercomputers. Leading researchers present results achieved on systems of the High Performance Computing Center Stuttgart (HLRS) for the year 2006. The reports cover all fields of computational science and engineering ranging from CFD via computational physics and chemistry to computer science with a special emphasis on industrially relevant applications. The book comes with illustrations and tables.
Author : Jonathan Ferreira
Publisher : Springer
ISBN 13 : 3540680357
Total Pages : 230 pages
Book Rating : 4.5/5 (46 download)
Download or read book Jets from Young Stars written by Jonathan Ferreira and published by Springer. This book was released on 2007-08-30 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume presents the edited lecture notes of the First JETSET School on Jets from Young Stars: Models and Constraints, held by the Marie Curie Research and Training Network on JET Simulations, Experiments and Theory. The first half of the book is devoted to general observational constraints. The second section is devoted to theoretical knowledge of magneto-hydrodynamic processes pertinent to the jet launching mechanism in young stars.
Author : Norma G. Sànchez
Publisher : Springer Science & Business Media
ISBN 13 : 9400710585
Total Pages : 583 pages
Book Rating : 4.4/5 (7 download)
Download or read book The Early Universe and the Cosmic Microwave Background: Theory and Observations written by Norma G. Sànchez and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 583 pages. Available in PDF, EPUB and Kindle. Book excerpt: The goal of the Daniel Chalonge School on Astrofundamental Physics is to contribute to a theory of the universe (and particularly of the early universe) up to the marks, and at the scientific height of, the unprecedented accuracy, existent and expected, in the observational data. The impressive development of modern cosmology during the last decades is to a large extent due to its unification with elementary particle physics and quantum field theory. The cross-section between these fields has been increasing setting up Astrofundamental Physics. The early universe is an exceptional (theoretical and experimental) laboratory in this new discipline. This NATO Advanced Study Institute provided an up dated understanding, from a fundamental physics and deep point of view, of the progress and key issues in the early universe and the cosmic microwave background: theory and observations. The genuine interplay with large scale structure formation and dark matter problem were discussed. The central focus was placed on the cosmic microwave background. Emphasis was given to the precise inter-relation between fundamental physics and cosmology in these problems, both at the theoretical and experimental/observational levels, within a deep and well defined programme which provided in addition, a careful interdisciplinarity. Special sessions were devoted to high energy cosmic rays, neutrinos in astrophysics, and high energy astrophysics. Deep understanding, clarification, synthesis, careful interdisciplinarity within a fundamental physics framework, were the main goals of the course.
Author : W.G. Unruh
Publisher : Springer Science & Business Media
ISBN 13 : 9400940157
Total Pages : 429 pages
Book Rating : 4.4/5 (9 download)
Download or read book The Early Universe written by W.G. Unruh and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 429 pages. Available in PDF, EPUB and Kindle. Book excerpt: List of Participants ••. ••. •. . . . •. . ••. . . ••. ••. •. •. . . ••. •. •. . . ••. • xi I. MOSS / The Quantum Origin of the Universe ••••. •. •. •••. •••. ••• M. S. TUru~ER / Cosmology and Particle Physics •. . •••. ••. •. . •••. •• 19 G. GELMINI / Supersynunetry and the Early Universe •••. •. ••. . •. •. . 115 J. D. BARROW / Relativistic Cosmology. . . . . . . . . . . . . . . . . . . . . . . . . . . 125 P. J. E. PEEBLES / Yet Another Scenario for Galaxy Formation . ••. 203 ?:1. B. '-lISE / Non-Gaussian Fluctuations. . . . . . . . . . . . . . . . . . . . . . . . . . 215 S. D. H. mUTE / N-body Hethods and the Formation of Large-Scale Structure • . •. . . . • . • • . • • • . . . • . . . . • • . . . • . • . . 239 • . . . • • . . . . • T. PI~~ / Numerical Relativity and Cosmology. . . . . . . . . . . . . . . . . . . 261 J. R. BOND / Distortions and Anisotropies of the Cosmic Background Radiation •. •. . . ••. ••. •••. ••••. . ••. . •••••. •• 283 J. V. HALL / The Early Universe - An Observer's View. . . . . . . . . . . . 335 G. GELHINI / Can the Solar Neutrino Problem be the First Detected Signature of Dark Hatter from the Halo of Our Galaxy? 351 A. K. DRUKIER / Detecting Cold Dark !1atter Candidates •. •. •. . . •. . 361 S. TOULMIN / The Early Universe: Historical and Philosophical Perspectives . •. •. . . . . . . •. . . . •••. •. •. •. •. . . . ••••. . •. •. • 393 INDEX . . •. . . •. . . ••. . . ••••. . . •••••. . . •. •. •. . •. . . . •. . •. •. . . ••. •••.
Author : Mohammad Ali Nawaz
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (144 download)
Download or read book Interaction of Hydra A Jets with the Intracluster Medium written by Mohammad Ali Nawaz and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The physics of jets from Active Galactic Nuclei (AGN) and their interaction with the interstellar medium (ISM) and intracluster medium (ICM) is an important research area of modern astronomy. Over the last few decades theoreticians have studied AGN jets both analytically and numerically. However, to date, a complete understanding on the jet energetics and composition, jet velocity, complex jet morphology and jet-ICM interaction is lacking. This thesis aims to understand the energetics and composition of the jet near its origin, its interaction with the galaxy and cluster, focussing on detailed models of the inner structure of the Hydra A radio source. Analysing radio observations of the inner lobes of Hydra A by Taylor et al. (1990), I confirm jet power estimates 1045 ergs s-1 derived byWise et al. (2007) from dynamical analysis of the X-ray cavities. With this result and a model for the galaxy atmosphere, I explore the jet-ICM interactions occurring on a scale of 20 kpc using relativistic hydrodynamic simulations. The key features of my modelling are that i) I identify the four bright knots in the northern jet at approximately 4, 7, 11 and 16 kpc (deprojected) from the radio core as biconical reconfinement shocks, which result when an over pressured jet starts to come into equilibrium with the galactic atmosphere ii) the curved morphology of the source and the turbulent transition of the jet to a plume are produced by the dynamical interaction of a precessing jet with the ICM. I study the inner 10 kpc of the northern jet utilising two dimensional axisymmetric simulations. Through an extensive parameter space study I deduce that the jet velocity is approximately 0.8c at a distance 0.5 kpc from the black hole. The combined constraints of jet power, the observed jet radius profile along the jet, and the estimated jet pressure and jet velocity imply a value of the jet density parameter 13 for the northern jet. To study the complex source morphology within 20 kpc (on the northern side) I generalise my axisymmetric model to a three dimensional jet-ICM interaction model incorporating jet precession. Utilising the jet parameters obtained from the best fit axisymmetric model, a range of precession periods and two values of the precession angle I produce a set of 3D models. With the precessing jet model I successfully reproduce key features of the inner 20 kpc of the Hydra A northern jet: i) Four bright knots along the jet trajectory at approximately correct locations; ii) The curvature of the jet within 10 kpc; iii) Turbulent transition of the jet to a plume; iv) A misaligned bright knot in the turbulent flaring zone. The best matching model for the Hydra A northern jet gives a precession period 1 Myr and a precession angle 20. A low Mach number 1:85 of the forward shock indicates a gentle heating of the ICM by the source in its early stages.
Author : Astronomisches Rechen-Institut
Publisher : Springer Science & Business Media
ISBN 13 : 3662123703
Total Pages : 1433 pages
Book Rating : 4.6/5 (621 download)
Download or read book Literature 1989, Part 1 written by Astronomisches Rechen-Institut and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 1433 pages. Available in PDF, EPUB and Kindle. Book excerpt: From the reviews: "Astronomy and Astrophysics Abstracts has appeared in semi-annual volumes since 1969 and it has already become one of the fundemental publications in the fields of astronomy, astrophysics and neighbouring sciences. It is the most important English-language abstracting journal in the mentioned branches. ...The abstracts are classified under more than a hundred subject categories, thus permitting a quick survey of the whole extended material. The AAA is a valuable and important publication for all students and scientists working in the fields of astronomy and related sciences. As such it represents a necessary ingredient of any astronomical library all over the world." Space Science Review# "Dividing the whole field plus related subjects into 108 categories, each work is numbered and most are accompanied by brief abstracts. Fairly comprehensive cross-referencing links relevant papers to more than one category, and exhaustive author and subject indices are to be found at the back, making the catalogues easy to use. The series appears to be so complete in its coverage and always less than a year out of date that I shall certainly have to make a little more space on those shelves for future volumes." The Observatory Magazine#
Author : Abraham Loeb
Publisher : Princeton University Press
ISBN 13 : 0691144923
Total Pages : 572 pages
Book Rating : 4.6/5 (911 download)
Download or read book The First Galaxies in the Universe written by Abraham Loeb and published by Princeton University Press. This book was released on 2013-01-15 with total page 572 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive, self-contained introduction to one of the most exciting frontiers in astrophysics today: the quest to understand how the oldest and most distant galaxies in our universe first formed. Until now, most research on this question has been theoretical, but the next few years will bring about a new generation of large telescopes that promise to supply a flood of data about the infant universe during its first billion years after the big bang. This book bridges the gap between theory and observation. It is an invaluable reference for students and researchers on early galaxies. The First Galaxies in the Universe starts from basic physical principles before moving on to more advanced material. Topics include the gravitational growth of structure, the intergalactic medium, the formation and evolution of the first stars and black holes, feedback and galaxy evolution, reionization, 21-cm cosmology, and more. Provides a comprehensive introduction to this exciting frontier in astrophysics Begins from first principles Covers advanced topics such as the first stars and 21-cm cosmology Prepares students for research using the next generation of large telescopes Discusses many open questions to be explored in the coming decade
Author : Luis C. Ho
Publisher :
ISBN 13 :
Total Pages : 830 pages
Book Rating : 4.3/5 (91 download)
Download or read book The Central Engine of Active Galactic Nuclei written by Luis C. Ho and published by . This book was released on 2007 with total page 830 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Egon Krause
Publisher : Springer Science & Business Media
ISBN 13 : 3642560342
Total Pages : 548 pages
Book Rating : 4.6/5 (425 download)
Download or read book High Performance Computing in Science and Engineering ’01 written by Egon Krause and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 548 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume summarizes the state of the art in supercomputing, with special emphasis on the industrial relevance of the presented results and methods. The book showcases an innovative usage of state-of-the-art modeling, novel numerical algorithms and the use of leading-edge high-performance computing systems in a GRID-like environment.
Author :
Publisher :
ISBN 13 :
Total Pages : 812 pages
Book Rating : 4.3/5 (91 download)
Download or read book Physics Briefs written by and published by . This book was released on 1992 with total page 812 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Wolfgang E. Nagel
Publisher : Springer Science & Business Media
ISBN 13 : 3540290648
Total Pages : 342 pages
Book Rating : 4.5/5 (42 download)
Download or read book High Performance Computing in Science and Engineering ' 05 written by Wolfgang E. Nagel and published by Springer Science & Business Media. This book was released on 2006-03-06 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides the advances in modelling and simulation on supercomputers. Presenting results achieved on systems of the High Performance Computing Center Stuttgart (HLRS) for the year 2005, these reports cover various fields of computational science and engineering, ranging from CFD via computational physics and chemistry to computer science.
Author : Egon Krause
Publisher : Springer Science & Business Media
ISBN 13 : 3540265899
Total Pages : 447 pages
Book Rating : 4.5/5 (42 download)
Download or read book High Performance Computing in Science and Engineering ' 04 written by Egon Krause and published by Springer Science & Business Media. This book was released on 2007-06-16 with total page 447 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the state-of-the-art in modelling and simulation on supercomputers. Leading German research groups present their results achieved on high-end systems of the High Performance Computing Center Stuttgart (HLRS) for the year 2004. The reports cover all fields of computational science and engineering ranging from computational fluid dynamics via computational physics and chemistry to computer science. Special emphasis is given to industrially relevant applications. Presenting results for both vector-systems and micro-processor based systems the book allows to compare performance levels and usability of a variety of supercomputer architectures. In the light of the success of the Japanese Earth-Simulator this book may serve as a guide book for a US response. The book covers the main methods in high performance computing. Its outstanding results in achieving highest performance for production codes are of particular interest for both the scientist and the engineer. The book comes with a wealth of coloured illustrations and tables of results.
